CRISPR/dCas9 DNA甲基化编辑在人类造血过程中是遗传的,并塑造免疫后代
Emily A Saunderson1, Hector Huerga Encabo2, Julie Devis3
1Centre for Haemato-Oncology, Barts Cancer Institute, John Vane Science Centre, Charterhouse Square, Queen Mary University of London, London EC1M 6BQ, United Kingdom.
概括
衰老会增加干细胞中的DNA甲基化 (DNAm). 针对人类干细胞/原始细胞 (HSPC) 中的p15 DNAm改变了小鼠的血细胞发育,显示出血造过程中的表观遗传变化的功能相关性.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 血液形成 血液形成 血液形成
- 干细胞生物学 干细胞生物学
背景情况:
- 衰老与人类基因促进者的异常DNA甲基化 (DNAm) 有关,特别是在骨髓干细胞中.
- 在血液性恶性瘤中也观察到DNAm变化,但它们的功能影响仍然不清楚.
研究的目的:
- 研究人类干细胞/原始细胞 (HSPC) 中DNA甲基化变化的生理意义.
- 为了确定p15促进体的向DNA甲基化是否会在体内影响血液形成.
主要方法:
- 使用dCas9-3A3L进行表观遗传编辑,以准人类HSPCs中的CDKN2B (p15) 促进体.
- 观察到DNAm在体外传播,在分化过程中维持,以及基因表达的变化.
- 将编辑的HSPC植入小鼠体内,以评估长期植入,DNAm稳定性以及对血液形成的谱系特异性影响.
主要成果:
- 在植入的HSPC中,p15促进体的向DNA高甲基化长期维持.
- p15高甲基化导致小鼠单细胞数量减少和粒细胞增加.
- 来自高甲基化HSPCs的单细胞表现出激活和炎症转录程序的增加.
- 在克隆性血液形成患者的外周血液中检测到p15促进体甲基化.
结论:
- 在人类HSPC中,DNA甲基化可以被专门向并稳定地维持.
- 在p15位点的异常DNA甲基化对血液形成有功能性的影响.
- 这些发现表明,与衰老相关的DNAm变化可能会影响体内血液形成,并具有临床意义.
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